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Defect engineering is promising to tailor the physical properties of 2D semiconductors for function‐oriented electronics and optoelectronics. Compared with the extensively studied 2D binary materials, the origin of defects and their influence on physical properties of 2D ternary semiconductors are not clarified. Here, the effect of defects on the electronic structure and optical properties of few‐layer...
It is challenging yet promising to design highly accessible N‐doped carbon skeletons to fully expose the active sites inside single‐atom catalysts. Herein, mesoporous N‐doped carbon hollow spheres with regulatable through‐pore size can be formulated by a simple sequential synthesis procedure, in which the condensed SiO2 is acted as removable dual‐templates to produce both hollow interiors and through‐pores,...
To cater to the swift advance of flexible wearable electronics, there is growing demand for flexible energy storage system (ESS). Aqueous zinc ion energy storage systems (AZIESSs), characterizing safety and low cost, are competitive candidates for flexible energy storage. Hydrogels, as quasi‐solid substances, are the appropriate and burgeoning electrolytes that enable high‐performance flexible AZIESSs...
Electric Double Layer Devices
In article number 2301798, Cheng‐Yan Xu, Yang Li, and co‐workers showcase the structure of electrical double layer at the interface of Li2Al2SiP2TiO13 solid electrolyte and WSe2, emphasizing the interactions between ions and electrons, along with the verification of potential distribution at the 2D/electrolyte interface using atomic force microscope.
Nanofluidic Devices
A nanofluidic aptamer nanoarray (NANa) enables the stochastic capture of single proteins at normal high concentrations from samples with ultrasmall volumes equivalent to a single cell by following Poisson statistics, forming a readily addressable single‐protein nanoarray. This approach offers a methodology and device that surpass both the concentration and volume limits of single‐protein...
Electric double layer (EDL) devices based on 2D materials have made great achievements for versatile electronic and opto‐electronic applications; however, the ion dynamics and electric field distribution of the EDL at the electrolyte/2D material interface and their influence on the physical properties of 2D materials have not been clearly clarified. In this work, by using Kelvin probe force microscope...
Single‐molecule experiments allow understanding of the diversity, stochasticity, and heterogeneity of molecular behaviors and properties hidden by conventional ensemble‐averaged measurements. They hence have great importance and significant impacts in a wide range of fields. Despite significant advances in single‐molecule experiments at ultralow concentrations, the capture of single molecules in solution...
Electrocatalytic Oxygen Reduction
In article number 2207991, Cheng‐Yan Xu and co‐workers develop a self‐sacrificing strategy to encapsulate single‐atom Fe‐N4O1 species into carbon hollow spheres assembled by ultrathin nanosheets Fe1–N–C hollow microspheres (Fe1/N‐HCMs). Such highly open architecture is supposed to be an ideal platform to isolate and fully expose single metal atoms. Benifiting from...
Single‐atom Fe–N–C (Fe1–N–C) materials represent the benchmarked electrocatalysts for oxygen reduction reaction (ORR). However, single Fe atoms in the carbon skeletons cannot be fully utilized due to the mass transfer limitation, severely restricting their intrinsic ORR properties. Herein, a self‐sacrificing template strategy is developed to fabricate ultrathin nanosheets assembled Fe1–N–C hollow...
The chemical generation of singlet oxygen (1O2) by the MoO42−‐catalyzed disproportionation of hydrogen peroxide (H2O2) has been widely applied in numerous catalytic processes; however, such molybdate ions cannot be administered for redox‐based cancer therapeutics. This work reports the albumin‐mediated biomimetic synthesis of highly active molybdenum sulfide (denoted MoB) nanocatalysts that mediate...
Bacterial biofilm‐related infectious diseases severely influence human health. Under typical situations, pathogens can colonize inert or biological surfaces and form biofilms. Biofilms are functional aggregates that coat bacteria with extracellular polymeric substances (EPS). The main reason for the failure of biofilm infection treatment is the low permeability and enrichment of therapeutic agents...
Transition metal–nitrogen–carbon (TM–N–C) catalysts have been intensely investigated to tackle the sluggish oxygen reduction reactions (ORRs), but insufficient accessibility of the active sites limits their performance. Here, by using solid ZIF‐L nanorods as self‐sacrifice templates, a ZIF‐phase‐transition strategy is developed to fabricate ZIF‐8 hollow nanorods with open cavities, which can be subsequently...
Exploring highly active and cost‐efficient single‐atom catalysts (SACs) for oxygen reduction reaction (ORR) is critical for the large‐scale application of Zn–air battery. Herein, density functional theory (DFT) calculations predict that the intrinsic ORR activity of the active metal of SACs follows the trend of Co > Fe > Ni ≈ Cu, in which Co SACs possess the best ORR activity due to its optimized...
Sonosensitizers‐assisted sonodynamic therapy (SDT) has been emerging as a promising treatment for cancers, and yet few specific regulations of band structure of sonosensitizers have been reported in relation to oxygen in tissues. Herein, by a gradient doping technique to modulate the band structure of hetero‐semiconductor nanorods, it is found that the reduction potential of band‐edge is very critical...
Excess generation of reactive oxygen species (ROS) based on sensitizers under ultrasound (US) excitation can cause the death of tumor cells via oxidative damage, but sonosensitizers are largely unexplored. Herein, oxygen‐deficient black BiOCl (B‐BiOCl) nanoplates (NPs) are reported, with post‐treatment on conventional BiOCl by simple UV excitation, showing stronger singlet oxygen (1O2) generation...
2D van der Waals (vdW) semiconductors hold great potentials for more‐than‐Moore field‐effect transistors (FETs), and the efficient utilization of their theoretical performance requires compatible high‐k dielectrics to guarantee the high gate coupling efficiency. The deposition of traditional high‐k dielectric oxide films on 2D materials usually generates interface concerns, thereby causing the carrier...
Clear cell renal cell carcinoma (ccRCC) is a serious and tenacious disease. Photodynamic therapy (PDT) and photothermal therapy (PTT) are effective means of cancer treatment. However, PDT combined with PTT has been rarely reported in ccRCC treatment. In the present study, by developing the core–shell structured TiO2@red phosphorus nanorods (TiO2@RP NRs) as a photosensitizer, the feasibility and effectiveness...
2D organic crystals exhibit efficient charge transport and field‐effect characteristics, making them promising candidates for high‐performance nanoelectronics. However, the strong Fermi level pinning (FLP) effect and large Schottky barrier between organic semiconductors and metals largely limit device performance. Herein, by carrying out temperature‐dependent transport and Kelvin probe force microscopy...
For next‐generation Internet‐of‐Everything applications, for example, artificial‐neural‐network image sensors, artificial retina, visible light communication, on‐chip light interconnection, and flexible devices, etc., high‐performance microscale photodetectors are in urgent demands. 2D material (2DM) photodetectors have been researched and demonstrated impressive performances. However, they have not...
Elemental tantalum is a well‐known biomedical metal in clinics due to its extremely high biocompatibility, which is superior to that of other biomedical metallic materials. Hence, it is of significance to expand the scope of biomedical applications of tantalum. Herein, it is reported that tantalum nanoparticles (Ta NPs), upon surface modification with polyethylene glycol (PEG) molecules via a silane‐coupling...
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